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19-1567; Rev 0; 1/00
NUAL KIT MA ATION ET EVALU TA SHE S DA OLLOW F
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Features
o Low Average CDMA Current Consumption in Typical Urban Scenario 55mA (MAX2267) 90mA (MAX2268) 50mA (MAX2269) o 0.5A Shutdown Mode Eliminates External Supply Switch o 0.8dB Gain Variation Over Temperature o No External Reference or Logic Interface Circuitry Needed o Supply Current and ACPR Margin Dynamically Adjustable o +2.7V to +4.5V Single-Supply Operation o 35% Efficiency at +2.7V Operation
General Description
The MAX2267/MAX2268/MAX2269 power amplifiers are optimized for IS-98-based CDMA and PDC cellular telephones operating in the Japanese cellular-frequency band. When matched for CDMA operation, the amplifiers achieve 27dBm output power with 35% efficiency (MAX2268), with margin over the adjacent and alternate channel specification. At a +17dBm output--a very common power level for CDMA phones--the MAX2268 still has 7% efficiency, yielding excellent overall talk time. At the same power level, the MAX2267/MAX2269 have an unprecedented 12%/17% efficiency, while still obtaining 28%/29% efficiency at maximum output power. The MAX2267/MAX2268/MAX2269 have internally referenced bias ports that are normally terminated with simple resistors. The bias ports allow customization of ACPR margin and gain. They can also be used to "throttle back" bias current when generating low power levels. The MAX2267/MAX2268/MAX2269 have excellent gain stability over temperature (0.8dB), so overdesign of driver stages and excess driver current are dramatically reduced, further increasing the phone's talk time. The devices can be operated from +2.7V to +4.5V while meeting all ACPR specifications over the entire temperature range. The devices are packaged in a 16-pin TSSOP with exposed paddle (EP). For module or direct chip attach applications, the MAX2267 is also available in die form.
MAX2267/MAX2268/MAX2269
Ordering Information
PART MAX2267EUE MAX2267E/D MAX2268EUE MAX2269EUE TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 16 TSSOP-EP Dice* 16 TSSOP-EP 16 TSSOP-EP
TSSOP-EP 5mm x 6.4mm
*Contact factory for dice specifications.
Applications
Cellular-Band CDMA Phones Cellular-Band PDC Phones 2-Way Pagers Power-Amplifier Modules
IN1 1
Pin Configurations/ Functional Diagrams
TOP VIEW MAX2267/MAX2269
16 IN0 15 BIAS2H 14 VCC BIAS 13 GND 12 NFP 11 OUT0 10 BIAS1L 9 OUT1
Selector Guide
HIGH POWER-ADDED EFFICIENCY (%) DEVICE CDMA AT +27dBm 28 34 29 CDMA AT +17dBm 12 7 17 PDC AT +29dBm -- 41 --
PWR 2 VCC 3 BIAS1H 4 VCC 5 SHDN 6 BIAS2L 7 OUT1 8
MAX2267 MAX2268 MAX2269
TSSOP-EP Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2267/MAX2268/MAX2269
ABSOLUTE MAXIMUM RATINGS
VCC to GND (no RF input) ........................................-0.3V to +5V Logic Inputs to GND...................................-0.3V to (VCC + 0.3V) BIAS_ _ to GND ..........................................-0.3V to (VCC + 0.3V) RF Input Power ...................................................+6dBm (20mW) Logic Input Current...........................................................10mA Output VSWR with +6dBm Input ..........................................2.5:1 Total DC Power Dissipation (TPADDLE = +100C) 16-Pin TSSOP-EP (derate 60mW/C above TPADDLE = +100C)..............................................4W JA .................................................................................8C/W Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +4.5V no input signal applied, V SHDN = 2.0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.5V and TA = +25C.) PARAMETER Operating Voltage Range Idle Current Shutdown Supply Current Logic Input Current High Logic Input Current Low Logic Threshold High Logic Threshold Low SYMBOL VCC ICC ICC MAX2267/MAX2269 MAX2268 SHDN = PWR = GND Logic = VCC Logic = GND -1 -1 2.0 0.8 PWR = VCC PWR = GND CONDITIONS MIN 2.7 100 34 90 0.5 10 5 1 A A A V V mA TYP MAX 4.5 UNITS V
AC ELECTRICAL CHARACTERISTICS--MAX2267
(MAX2267 EV kit, VCC = VPWR = V SHDN = +3.5V, fIN = 906MHz, CDMA modulation, SHDN = VCC, matching networks tuned for 887MHz to 925MHz operation, 50 system, TA = +25C, unless otherwise noted.) PARAMETER Frequency Range (Notes 1, 2) SYMBOL fIN GP TA = +25C Power Gain (Note 1) TA = TMIN to TMAX PWR = GND Gain Variation vs. Temperature (Note 1) Output Power (High-Power Mode) (Note 1) TA = TMIN to TMAX, relative to TA = +25C ACPR specification met with fIN = 887MHz to 925MHz ACPR specification met with fIN = 887MHz to 925MHz PWR = VCC PWR = VCC = 2.8V PWR = GND PWR = GND, VCC = 2.8V 27 dBm 24.5 16 14 25.5 17.5 15.5 dBm CONDITIONS PWR = VCC or GND MIN 887 24.5 23 20.5 23 0.8 dB 26 dB TYP MAX 925 UNITS MHz
POUT
Output Power (Low-Power Mode) (Note 1)
POUT
2
_______________________________________________________________________________________
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
AC ELECTRICAL CHARACTERISTICS--MAX2267 (continued)
(MAX2267 EV kit, VCC = VPWR = V SHDN = +3.5V, fIN = 906MHz, CDMA modulation, SHDN = VCC, matching networks tuned for 887MHz to 925MHz operation, 50 system, TA = +25C, unless otherwise noted.) PARAMETER Adjacent-Channel Power Ratio Limit (Notes 1, 2) Alternate-Channel Power Ratio Limit (Notes 1, 2) Power-Added Efficiency (Note 3) Power-Mode Switching Time Turn-On Time (Notes 1, 4) Maximum Input VSWR Nonharmonic Spurious due to Load Mismatch (Notes 1, 5) Noise Power (Note 6) Harmonic Suppression VSWR SYMBOL ACPR ACPR PAE CONDITIONS VCC = 2.8V to 4.5V, offset = 885kHz, 30kHz BW, fIN = 887MHz to 925MHz VCC = 2.8V to 4.5V, offset = 1980kHz, 30kHz BW, fIN = 887MHz to 925MHz PWR = VCC, POUT = +27dBm PWR = GND, POUT = 17.5dBm (Note 4) PWR = VCC or GND fIN = 887MHz to 925MHz, PWR = GND or VCC PIN = +6dBm Measured at 851MHz PWR = GND, measured at 851MHz (Note 7) -137 -134 32 MIN -44 -56 TYP -48 -57.5 28 12 550 1 2.3:1 -60 dBc dBm/Hz dBc 5 MAX UNITS dBc dBc % ns s
MAX2267/MAX2268/MAX2269
AC ELECTRICAL CHARACTERISTICS--MAX2268
(MAX2268 EV kit, VCC = V SHDN = +3.5V, fIN = 906MHz, CDMA modulation, matching networks tuned for 887MHz to 925MHz operation, 50 system, TA = +25C, unless otherwise noted.) PARAMETER Frequency Range (Notes 1, 2) Power Gain (Note 1) Gain Variation vs. Temperature (Note 1) SYMBOL fIN GP TA = +25C TA = TMIN to TMAX TA = TMIN to TMAX, relative to TA = +25C ACPR specification met with fIN = 887MHz to 925MHz VCC = 3.5V VCC = 2.8V 27 dBm 24.5 -44 -56 25.5 -48 -57.5 35 5.5 1 VSWR fIN = 887MHz to 925MHz 1.5:1 5 dBc dBc % s CONDITIONS MIN 887 25.5 24 0.7 27 TYP MAX 925 UNITS MHz dB dB
Output Power (Note 1)
POUT
Adjacent-Channel Power Ratio (Notes 1, 2) Alternate-Channel Power Ratio (Notes 1, 2) Power-Added Efficiency (Note 3) Turn-On Time (Notes 1, 4) Maximum Input VSWR
ACPR ACPR PAE
VCC = 2.8V to 4.5V, offset = 885kHz, 30kHz BW, fIN = 887MHz to 925MHz VCC = 2.8V to 4.5V, offset = 1980kHz, 30kHz BW, fIN = 887MHz to 925MHz PIN adjusted to give POUT = 27dBm PIN adjusted for POUT = 13.6dBm
_______________________________________________________________________________________
3
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2267/MAX2268/MAX2269
AC ELECTRICAL CHARACTERISTICS--MAX2268 (continued)
(MAX2268 EV kit, VCC = V SHDN = +3.5V, fIN = 906MHz, CDMA modulation, matching networks tuned for 887MHz to 925MHz operation, 50 system, TA = +25C, unless otherwise noted.) PARAMETER Nonharmonic Spurious Due to Load Mismatch (Notes 1, 5) Noise Power (Note 6) Harmonic Suppression SYMBOL PIN = +6dBm Measured at 851MHz (Note 7) -138 47 CONDITIONS MIN TYP MAX -60 UNITS dBc dBm/Hz dBc
AC ELECTRICAL CHARACTERISTICS--MAX2269
(MAX2269 EV kit, VCC = VPWR = V SHDN = +3.5V, fIN = 906MHz, CDMA modulation, SHDN = VCC, matching networks tuned for 887MHz to 925MHz operation, 50 system, TA = +25C, unless otherwise noted.) PARAMETER Frequency Range (Notes 1, 2) SYMBOL fIN GP TA = +25C Power Gain (Note 1) TA = TMIN to TMAX PWR = GND PWR = VCC Gain Variation vs. Temperature (Note 1) Output Power (High-Power Mode) (Note 1) TA = TMIN to TMAX, relative to TA = +25C ACPR specification met with fIN = 887MHz to 925MHz ACPR specification met with fIN = 887MHz to 925MHz PWR = VCC PWR = VCC = 2.8V PWR = GND PWR = GND, VCC = 2.8V 27 dBm 24.5 15.5 13.5 25.5 17 dBm 15 CONDITIONS PWR = VCC or GND MIN 887 24.5 23 23.5 26 0.8 dB 26 dB TYP MAX 925 UNITS MHz
POUT
Output Power (Low-Power Mode) (Note 1) Adjacent-Channel Power Ratio Limit (Notes 1, 2) Alternate-Channel Power Ratio Limit (Notes 1, 2) Power-Added Efficiency (Note 3)
POUT
ACPR ACPR PAE
VCC = 2.8V to 4.5V, offset = 885kHz, 30kHz BW, fIN = 887MHz to 925MHz VCC = 2.8V to 4.5V, offset = 1980kHz, 30kHz BW, fIN = 887MHz to 925MHz PWR = VCC, POUT = +27dBm PWR = GND, POUT = 17dBm
-44 -56
-48 -57.5 29 17
dBc dBc %
4
_______________________________________________________________________________________
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
AC ELECTRICAL CHARACTERISTICS--MAX2269 (continued)
(MAX2269 EV kit, VCC = VPWR = V SHDN = +3.5V, fIN = 906MHz, CDMA modulation, SHDN = VCC, matching networks tuned for 887MHz to 925MHz operation, 50 system, TA = +25C, unless otherwise noted.) PARAMETER Power-Mode Switching Time Turn-On Time (Notes 1, 4) Maximum Input VSWR Nonharmonic Spurious due to Load Mismatch (Notes 1, 5) Noise Power (Note 6) Harmonic Suppression VSWR SYMBOL (Note 4) PWR = VCC or GND fIN = 887MHz to 925MHz, PWR = GND or VCC PIN = +6dBm Measured at 851MHz PWR = GND, measured at 851MHz (Note 7) -137 -130 32 CONDITIONS MIN TYP 550 1 2.4:1 -60 dBc dBm/Hz dBc 5 MAX UNITS ns s
MAX2267/MAX2268/MAX2269
Note 1: Minimum and maximum values are guaranteed by design and characterization, not production tested. Note 2: PMAX is met over this frequency range at the ACPR limit with a single matching network. For optimum performance at other frequencies, the output matching network must be properly designed. See the Applications Information section. Operation between 750MHz and 1000MHz is possible but has not been characterized. Note 3: PAE is specified into a 50 load, while meeting the ACPR requirement. Note 4: Time from logic transition until POUT is within 1dB of its final mean power. Note 5: Murata isolator as load with 20:1 VSWR any phase angle after isolator. Note 6: Noise power can be improved by using the circuit in Figures 1 and 2. Note 7: Harmonics measured on the evaluation kit, which provides some harmonic attenuation in addition to the rejection provided by the IC. The combined suppression is specified.
Typical Operating Characteristics
(MAX2267/MAX2268/MAX2269 EV kits, VCC = +3.5V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2267 SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
MAX2267/9-01
MAX2267 GAIN vs. SUPPLY VOLTAGE
MAX2267/9-02
MAX2267 GAIN vs. SUPPLY VOLTAGE
PWR = GND TA = -40C 26 TA = +25C
MAX2267/9-03
140 120 SUPPLY CURRENT (nA) 100 PWR = GND SHDN = GND NO INPUT DRIVE TA = +85C
30
PWR = VCC TA = -40C
28
28
GAIN (dB)
80 60 40 20
24
TA = +25C 22 TA = -40C
TA = +25C
TA = +85C
GAIN (dB)
26
24
22 TA = +85C 20
0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
20 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
18 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2267/MAX2268/MAX2269
Typical Operating Characteristics (continued)
(MAX2267/MAX2268/MAX2269 EV kits, VCC = +3.5V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2267 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
MAX2267/9-04
MAX2267 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
MAX2267/9-05
MAX2267 OUTPUT POWER vs. INPUT POWER
PWR = VCC
MAX2267/9-06
34
14 13 12 PAE (%) 11
PWR = VCC
PWR = GND TA = -40C
32 31 OUTPUT POWER (dBm) 30 29 28 27 26 25
32 TA = -40C PAE (%) 30
TA = -40C
28 10 26 TA = +85C TA = +25C 9 8 2.5 3.0 3.5 4.0 4.5 5.0 2.5 3.0
TA = +85C
TA = +25C
TA = +85C TA = +25C
24 SUPPLY VOLTAGE (V)
3.5
4.0
4.5
5.0
0
2
4 INPUT POWER (dBm)
6
8
SUPPLY VOLTAGE (V)
MAX2267 OUTPUT POWER vs. INPUT POWER
MAX2267/9-07
MAX2267 GAIN vs. OUTPUT POWER
PWR = VCC TA = -40C TA = +25C
MAX2267/9-08
MAX2267 GAIN vs. OUTPUT POWER
PWR = GND TA = -40C 25
MAX2267/9-09
24
PWR = GND
28
26
OUTPUT POWER (dBm)
20 TA = +25C 16
TA = -40C GAIN (dB)
27
GAIN (dB)
26
24
25
23 TA = +25C
TA = +85C 12 24 TA = +85C 22 TA = +85C 8 -14 -12 -10 -8 -6 -4 -2 INPUT POWER (dBm) 23 0 5 10 15 20 25 30 35 OUTPUT POWER (dBm) 21 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm)
MAX2267 SUPPLY CURRENT vs. OUTPUT POWER
MAX2267/9-10
MAX2267 SUPPLY CURRENT vs. OUTPUT POWER
MAX2267/9-11
MAX2267 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
PWR = VCC TA = +85C
MAX2267/9-12
800 PWR = VCC SUPPLY CURRENT (mA) 600
160
PWR = GND
-30
TA = +85C TA = +25C
SUPPLY CURRENT (mA)
120
-40 ACPR (dBc)
-50 TA = +25C TA = -40C
400
80 TA = -40C
-60
200
40 -70
0 0 5 10 15 20 25 30 35 OUTPUT POWER (dBm)
0 0 3 6 9 12 15 18 OUTPUT POWER (dBm)
-80 5 10 15 20 25 30 OUTPUT POWER (dBm)
6
_______________________________________________________________________________________
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Typical Operating Characteristics (continued)
(MAX2267/MAX2268/MAX2269 EV kits, VCC = +3.5V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2267 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
MAX2267/9-13
MAX2267/MAX2268/MAX2269
MAX2267 ALTERNATE-CHANNEL POWER RATIO vs. OUTPUT POWER
MAX2267/9-14
MAX2267 ALTERNATE-CHANNEL POWER RATIO vs. OUTPUT POWER
PWR = GND TA = +85C TA = -40C -60 TA = +25C
MAX2267/9-15
-30
PWR = GND
-40
-40
TA = +85C TA = +25C
PWR = VCC TA = +85C TA = +25C
-40 ACPR (dBc)
-50 ACPR (dBc)
-50 ACPR (dBc)
-50
-60
-60
TA = -40C
-70
TA = -40C
-70
-70
-80
-80
-80 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm)
-90 5 10 15 20 25 30 OUTPUT POWER (dBm)
-90 -5 0 5 10 15 20 OUTPUT POWER (dBm)
MAX2267 ADJACENT-CHANNEL POWER RATIO vs. FREQUENCY
MAX2267/9-16
MAX2267 ALTERNATE-CHANNEL POWER RATIO vs. FREQUENCY
MAX2267/9-17
MAX2267 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
PWR = VCC
MAX2267/9-18
-30
PWR = VCC POUT = +27dBm TA = +85C
-40
PWR = VCC POUT = +27dBm TA = +85C
55 50 45 40 35 PAE (%) 30 25 20 15 10 5 0
-40 ACPR (dBc)
-50 ACPR (dBc)
-50 TA = +25C TA = -40C
-60 TA = +25C -70 TA = -40C
VCC = 2.7V
-60
-70
-80
VCC = 3.5V
-80 880 890 900 910 920 930 FREQUENCY (MHz)
-90 880 890 900 910 920 930 FREQUENCY (MHz)
0
5
10
15
20
25
30
35
OUTPUT POWER (dBm)
MAX2267 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
MAX2267/9-19
MAX2267 POWER-ADDED EFFICIENCY vs. FREQUENCY
MAX2267/9-20
MAX2267 POWER-ADDED EFFICIENCY vs. FREQUENCY
PWR = GND POUT = +17dBm TA = -40C
MAX2267/9-21
20 PWR = GND 15 TA = -40C PAE (%) 10 TA = +25C
34 PWR = VCC POUT = +27dBm 32 TA = -40C
20
15 PAE (%) PAE (%) 30
28 10 5 TA = +85C 0 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm) 24 880 890 900 910 920 930 FREQUENCY (MHz) 5 880 26 TA = +25C TA = +85C
TA = +25C
TA = +85C
890
900
910
920
930
FREQUENCY (MHz)
_______________________________________________________________________________________
7
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2267/MAX2268/MAX2269
Typical Operating Characteristics (continued)
(MAX2267/MAX2268/MAX2269 EV kits, VCC = +3.5V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2268 SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
MAX2267/9-22
MAX2268 GAIN vs. SUPPLY VOLTAGE
MAX2267/9-23
MAX2268 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
MAX2267/9-24
140 120 SUPPLY CURRENT (nA) 100
30 TA = -40C 28
40 TA = -40C
38
TA = +25C
GAIN (dB)
80 60 40 20
TA = +25C 24
TA = +85C
PAE (%)
TA = +85C
26
36 TA = +85C
34
TA = +25C 22 TA = -40C 32
0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
20 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
30 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
MAX2268 OUTPUT POWER vs. INPUT POWER
MAX2267/9-25
MAX2268 GAIN vs. OUTPUT POWER
MAX2267/9-26
MAX2268 SUPPLY CURRENT vs. OUTPUT POWER
MAX2267/9-27
32 31 OUTPUT POWER (dBm) 30 29
VCC = 3.5V TA = -40C
28
800
27
TA = +25C 28 27 26 TA = +85C
GAIN (dB)
26 TA = +85C 25 TA = +25C TA = -40C 24 VCC = 3.5V
SUPPLY CURRENT (mA)
600
400
200 USING OPTIONAL TB CIRCUIT IN FIGURE 2 0
25 0 2 4 INPUT POWER (dBm) 6 8
23 0 5 10 15 20 25 30 35 OUTPUT POWER (dBm)
0
5
10
15
20
25
30
35
OUTPUT POWER (dBm)
MAX2268 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
MAX2267/9-28
MAX2268 ALTERNATE-CHANNEL POWER RATIO vs. OUTPUT POWER
MAX2267/9-29
MAX2268 ADJACENT-CHANNEL POWER RATIO vs. FREQUENCY
MAX2267/9-30
-30
-40
-30
-40 TA = +85C ACPR (dBc)
-50 ACPR (dBc)
TA = +85C ACPR (dBc)
-40
TA = +85C
-50
-60
-50 TA = +25C TA = -40C
-60 TA = +25C -70 TA = -40C
-70 TA = +25C
TA = -40C
-60
-80
-70
-80 5 10 15 20 25 30 OUTPUT POWER (dBm)
-90 5 10 15 20 25 30 OUTPUT POWER (dBm)
-80 880 890 900 910 920 930 FREQUENCY (MHz)
8
_______________________________________________________________________________________
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Typical Operating Characteristics (continued)
(MAX2267/MAX2268/MAX2269 EV kits, VCC = +3.5V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2268 ALTERNATE-CHANNEL POWER RATIO vs. FREQUENCY
MAX2267/9-31
MAX2267/MAX2268/MAX2269
MAX2268 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
MAX2267/9-32
MAX2268 POWER-ADDED EFFICIENCY vs. FREQUENCY
MAX2267/9-33
-40 TA = +85C
55 50 45 40 35 PAE (%) 30 25 20 15 VCC = 3.5V 10 5 0 VCC = 2.7V
40 TA = -40C
-50 ACPR (dBc)
38
TA = +25C -70
TA = -40C
PAE (%)
-60
36 TA = +25C TA = +85C
34
-80
32
-90 880 890 900 910 920 930 FREQUENCY (MHz)
30 0 5 10 15 20 25 30 35 880 890 900 910 920 930 OUTPUT POWER (dBm) FREQUENCY (MHz)
MAX2269 SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
MAX2267/9-34
MAX2269 GAIN vs. SUPPLY VOLTAGE
PWR = VCC TA = -40C
MAX2267/9-35
140 120 SUPPLY CURRENT (nA) 100 80 60 40 20
PWR = GND SHDN = GND NO INPUT DRIVE
30
28
GAIN (dB)
TA = +85C
26 TA = +85C 24 TA = +25C
TA = +25C 22 TA = -40C
0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
20 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
MAX2269 GAIN vs. SUPPLY VOLTAGE
MAX2267/9-36
MAX2269 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
MAX2267/9-37
MAX2269 POWER-ADDED EFFICIENCY vs. SUPPLY VOLTAGE
PWR = GND TA = -40C
MAX2267/9-38
30
PWR = GND
34
TA = -40C
PWR = VCC
19 18 17
28
32 TA = -40C
GAIN (dB)
PAE (%)
PAE (%)
26
30
16 15 14 13
TA = +25C
24 TA = +85C 22 TA = +25C
28 TA = +85C 26 TA = +25C TA = +85C
20 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
24 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
9
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2267/MAX2268/MAX2269
Typical Operating Characteristics (continued)
(MAX2267/MAX2268/MAX2269 EV kits, VCC = +3.5V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2269 OUTPUT POWER vs. INPUT POWER
MAX2267/9-39
MAX2269 OUTPUT POWER vs. INPUT POWER
MAX2267/9-40
MAX2269 GAIN vs. OUTPUT POWER
PWR = VCC TA = +25C TA = -40C
MAX2267/9-41
32 31 OUTPUT POWER (dBm) 30 29
PWR = VCC
24
PWR = GND T = -40C A
28
OUTPUT POWER (dBm)
TA = -40C
20 GAIN (dB)
27
TA = +85C 28 27 26 25 0 2 4 INPUT POWER (dBm) 6 8 TA = +25C
16 TA = +25C 12
TA = +85C
26
25 TA = +85C 24
8 -14 -12 -10 -8 -6 -4 -2 INPUT POWER (dBm)
23 0 5 10 15 20 25 30 35 OUTPUT POWER (dBm)
MAX2269 GAIN vs. OUTPUT POWER
MAX2267/9-42
MAX2269 SUPPLY CURRENT vs. OUTPUT POWER
MAX2267/9-43
MAX2269 SUPPLY CURRENT vs. OUTPUT POWER
PWR = GND
MAX2267/9-44
29
800
PWR = GND TA = -40C
PWR = VCC
160
28
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
600
120 TA = +85C 80 TA = +25C
GAIN (dB)
27
400
26
200 25 TA = +25C TA = +85C 0 -10 -5 0 5 10 15 20 0 5 10 15 20 25 30 35 OUTPUT POWER (dBm) OUTPUT POWER (dBm)
40
TA = -40C
24
0 0 3 6 9 12 15 18 OUTPUT POWER (dBm)
MAX2269 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
MAX2267/9-45
MAX2269 ADJACENT-CHANNEL POWER RATIO vs. OUTPUT POWER
MAX2267/9-46
MAX2269 ALTERNATE-CHANNEL POWER RATIO vs. OUTPUT POWER
PWR = VCC TA = +85C TA = +25C ACPR (dBc) -60
MAX2267/9-47
-30
PWR = VCC TA = +85C
-30
-40
PWR = GND TA = +85C
-40 ACPR (dBc)
-40 ACPR (dBc) TA = +25C -50
-50
-50 TA = +25C TA = -40C
-60
-60
TA = -40C
-70
TA = -40C
-70
-70
-80
-80 5 10 15 20 25 30 OUTPUT POWER (dBm)
-80 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm)
-90 5 10 15 20 25 30 OUTPUT POWER (dBm)
10
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+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Typical Operating Characteristics (continued)
(MAX2267/MAX2268/MAX2269 EV kits, VCC = +3.5V, SHDN = VCC, CDMA modulation, TA = +25C, unless otherwise noted.)
MAX2269 ALTERNATE-CHANNEL POWER RATIO vs. OUTPUT POWER
MAX2267/9-48
MAX2267/MAX2268/MAX2269
MAX2269 ADJACENT-CHANNEL POWER RATIO vs. FREQUENCY
MAX2267/9-49
MAX2269 ALTERNATE-CHANNEL POWER RATIO vs. FREQUENCY
PWR = VCC POUT = +27dBm
MAX2267/9-50
-40
PWR = GND TA = +85C TA = -40C
-30
PWR = VCC POUT = +27dBm
-40
-50 ACPR (dBc)
-40 ACPR (dBc)
TA = +85C
-50 ACPR (dBc)
TA = +85C
-60 -70
-50 TA = -40C
-60 TA = +25C TA = -40C
-60
TA = +25C -80 -70
TA = +25C
-70
-80
-90 -5 0 5 10 15 20 OUTPUT POWER (dBm)
-80 880 890 900 910 920 930 FREQUENCY (MHz)
-90 880 890 900 910 920 930 FREQUENCY (MHz)
MAX2269 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
MAX2267/9-51
MAX2269 POWER-ADDED EFFICIENCY vs. OUTPUT POWER
PWR = GND TA = -40C TA = +25C 15 PAE (%)
MAX2267/9-52
55 50 45 40 35 PAE (%) 30 25 20 15 10 5 0 0
20
PWR = VCC
VCC = 2.7V
10 TA = +85C
VCC = 3.5V
5
0 5 10 15 20 25 30 35 -10 -5 0 5 10 15 20 OUTPUT POWER (dBm) OUTPUT POWER (dBm)
MAX2269 POWER-ADDED EFFICIENCY vs. FREQUENCY
MAX2267/9-53
MAX2269 POWER-ADDED EFFICIENCY vs. FREQUENCY
PWR = GND POUT = +17dBm
MAX2267/9-54
34 PWR = VCC POUT = +27dBm 32 TA = -40C PAE (%)
25
20 PAE (%)
TA = -40C
30
28
TA = +25C
TA = +85C
15
TA = +25C TA = +85C
26 10 880 890 900 910 920 930 880 890 900 910 920 930 FREQUENCY (MHz) FREQUENCY (MHz)
24
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11
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2267/MAX2268/MAX2269
Pin Description
PIN MAX2267 MAX2269 1 2 3, 5, 14 4 6 7 8, 9 10 11 12 -- 13, Slug 15 16 MAX2268 1 -- 3, 5 4 2, 6 -- 8, 9 -- -- 12 7, 10, 11, 14, 16 13, Slug 15 -- NAME IN1 PWR VCC BIAS1H SHDN BIAS2L OUT1 BIAS1L OUT0 NFP N.C. GND BIAS2H IN0 FUNCTION RF Input Port. Requires external matching network. Mode-Select Input. Drive low to select the low-power mode (BIAS1L and BIAS2L). Drive high to select high-power mode (BIAS1H and BIAS2H). Voltage Supply. It is critical to bypass these pins with capacitors to GND as close to the pins as possible. High-Power Mode First Stage Bias Control. See General Description. Shutdown Control Input. Drive SHDN low to enable shutdown. Drive high for normal operation. On the MAX2268, make sure that both pins get driven simultaneously. To place the MAX2267 into shutdown mode, also pull the PWR pin low. Low-Power Mode Second Stage Bias Control. See General Description. RF Output Ports. Require an appropriate output matching network and collector bias. Low-Power Mode First Stage Bias Control. See General Description. RF Output Port. Requires an appropriate output matching network and collector bias. Noise Filtering Pin. Connect noise filtering network as described in Noise Filtering section. If unused, leave open. Not internally connected. Do not make any connections to these pins. Ground. Solder the package slug to high-thermal-conductivity circuit board ground plane. High-Power Mode Second Stage Bias Control. See General Description. RF Input Port. Requires external matching network.
Detailed Description
The MAX2267/MAX2268/MAX2269 are linear power amplifiers (PAs) intended for CDMA and TDMA applications. The devices have been fully characterized in the 887MHz to 925MHz Japanese cellular band and can be used from 750MHz to 1000MHz by adjusting the input and output match. In CDMA applications, they provide +27dBm of output power and up to 35% power-added efficiency (PAE) from a single +2.7V to +4.5V supply. An inherent drawback of traditional PAs is that their efficiency drops rapidly with reduced output power. For example, in a PA designed for maximum efficiency at +27dBm, the efficiency at +15dBm falls well below 4.5% (over 200mA from a 3.5V supply). This behavior significantly reduces talk time in CDMA phones because over 90% of the time they are at output powers below +16dBm. The MAX2267/MAX2268/MAX2269
12
are optimized for lowest current draw at output powers that are most likely to occur in real-life situations. This provides up to 50% reduced average PA current.
High-Power and Low-Power Modes
The MAX2267/MAX2269 are designed to provide optimum PAE in both high- and low-power modes. For a +3.5V supply, maximum output power is +27dBm in high-power mode. In low-power mode, output power is +17dBm and +17.5dBm, respectively. Use the system's microcontroller to determine required output power, and switch between the two modes as appropriate with the PWR logic pin.
Bias Control
The bias current of the first stage in low-power mode is proportional to the current flowing out of BIAS1L. The voltage at BIAS1L is fixed by an internal bandgap refer-
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+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
ence, so the current out of this pin is inversely proportional to the value of the resistor between this pin and ground. Similarly, the bias current of the first stage in high-power mode is proportional to the current flowing out of BIAS1H. The current in the second stage is proportional to the currents out of BIAS2L and BIAS2H for low- and high-power modes, respectively. Additionally, these resistors allow for customization of gain and alternate- and adjacent-channel power ratios. Increasing the bias current in the first stage increases the gain and improves alternate-channel power ratio at the expense of efficiency. Increasing the bias current in the second stage increases gain at the expense of efficiency as well as adjacent- and alternate-channel power ratios. The PA bias current can be dynamically adjusted by summing a current into the bias pin of interest with an external source such as a DAC. See the MAX2268 Typical Application Circuit for using a voltage DAC and current setting resistors RTB1 and RTB2. Choosing RTB1 = R1 and RTB2 = R2 allows current adjustment between 0mA to double the nominal idle current with DAC voltages between 0V and 2.4V. The DAC must be able to source approximately 100A.
MAX2267/MAX2268/MAX2269
Shutdown Mode
Pull pins 2 and 6 low to place the MAX2267/MAX2268/ MAX2269 into shutdown mode. In this mode, all gain stages are disabled and supply current drops to 0.5A.
Applications Information
Increasing Efficiency
The MAX2269 incorporates an additional external switch to increase efficiency to 17% at +17dBm and to 29% at +27dBm. This increase in efficiency is mainly due to the additional isolation between the high- and low-power outputs provided by the external switch.
External Components
The MAX2267/MAX2268/MAX2269 require matching circuits at their inputs and outputs for operation in a 50 system. The simplified application circuits in Figures 1, 2, and 3 describe the topology of the circuit-
RFIN
C2 L1 C1 L2
MAX2267
L3 PWR 1 C3 C11 VCC RH1 2 3 BIAS 4 5 6 7 RL2 VCC L4 C4 C7 RFOUT C9 8 16 15 14 13 12 11 10 9 RL1 C8 L5 VCC C5 C6 C13 VCC OPTIONAL NOISE-REDUCTION CIRCUIT L6 RH2
C12 VCC SHDN
Figure 1. MAX2267 Typical Application Circuit ______________________________________________________________________________________ 13
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2267/MAX2268/MAX2269
ry for each device. For more detailed circuit diagrams, refer to the MAX2267/MAX2268/MAX2269 EV kit manual. The EV kit manual suggests component values that are optimized for best simultaneous efficiency and return loss performance. Use high-quality components in these matching circuits for greatest efficiency. To minimize coupling between different sections of the system, the ideal power-supply layout is a star configuration with a large decoupling capacitor at a central VCC node. The VCC traces branch out from this central node, each leading to a separate VCC node on the PC board. A second bypass capacitor with low ESR at the RF frequency of operation is located at the end of each trace. This arrangement provides local decoupling at the VCC pin. Input and output impedance-matching networks are very sensitive to layout-related parasitics. It is important to keep all matching components as close to the IC as possible to minimize the effects of stray inductance and stray capacitance of PC board traces.
Layout and Power-Supply Bypassing
A properly designed PC board is essential to any RF/microwave circuit. Be sure to use controlled impedance lines on all high-frequency inputs and outputs. Proper grounding of the GND pins is fundamental; if the PC board uses a topside RF ground, connect all GND pins (especially the TSSOP package exposed GND pad) directly to it. On boards where the ground plane is not on the component side, it's best to connect all GND pins to the ground plane with plated through-holes close to the package.
RFIN OPTIONAL TB CIRCUIT TX POWER L1 RTB2 C1 RTB1
MAX2268
C3 C11 VCC R1 L3 1 2 3 4 C12 VCC SHDN 5 6 7 8 VCC L4 C4 L6 C7 RFOUT C6 C9 BIAS 16 15 14 13 12 11 10 9 L7 OPTIONAL NOISE-REDUCTION CIRCUIT C13 R2
Figure 2. MAX2268 Typical Application Circuit 14 ______________________________________________________________________________________
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers
Noise Filtering
For improved noise performance, the MAX2267/ MAX2268/MAX2269 allow for additional noise filtering for further suppression of transmit noise. Use the recommended component values in the MAX2267/ MAX2268/MAX2269 EV kit manual for optimal noise power.
MAX2267/MAX2268/MAX2269
RFIN
C2 L1 C1 L2
MAX2269
L3 PWR 1 C3 C11 VCC RH1 C12 VCC SHDN RL2 VCC L4 C4 2 3 4 5 6 7 8 BIAS 16 15 14 13 12 11 10 9 RL1 C6 C13 L6 VCC RH2
OPTIONAL NOISEREDUCTION CIRCUIT L5 VCC C5
U1 UPG152TA C7 N.C. 2
3 6 4 5
PWR
C9 R1 OPTIONAL RFOUT L7
C8
Figure 3. MAX2269 Typical Application Circuit
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15
+2.7V, Single-Supply, Cellular-Band Linear Power Amplifiers MAX2267/MAX2268/MAX2269
Pin Configurations/ Functional Diagrams (continued)
TOP VIEW MAX2268
IN1 1 SHDN VCC BIAS1H VCC 2 3 BIAS 4 5 16 N.C. 15 BIAS2H 14 N.C. 13 GND 12 NFP 11 N.C. 10 N.C. 9 OUT1
Chip Information
TRANSISTOR COUNT: 1256
SHDN 6 N.C. OUT1 7 8
TSSOP-EP
Package Information
16
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